PI33xx-x0

Cool-Power®
PI33xx-x0
8 V to 36 VIN Cool-Power ZVS Buck Regulator Family
Product Description
Features & Benefits
The PI33xx-x0 is a family of high efficiency, wide input range
DC-DC ZVS-Buck regulators integrating controller, power
switches, and support components all within a high density
System-in-Package (SiP). The integration of a high
performance Zero-Voltage Switching (ZVS) topology, within
the PI33xx-x0 series, increases point of load performance
providing best in class power efficiency. The PI33xx-x0
requires only an external inductor and minimal capacitors to
form a complete DC-DC switching mode Buck Regulator.
• High Efficiency ZVS-Buck Topology
Device
• Wide input voltage range of 8V to 36V
• Very-Fast transient response
• High accuracy pre-trimmed output voltage
• User adjustable soft-start & tracking
• Power-up into pre-biased load (select versions)
• Parallel capable with single wire current sharing
• Input Over/Undervoltage Lockout (OVLO/UVLO)
• Output Overvoltage Protection (OVP)
Output Voltage
IOUT Max
• Overtemperature Protection (OTP)
Set
Range
PI3311-x0-LGIZ
1.0 V
1.0 to 1.4 V
10 A
PI3318-x0-LGIZ
1.8 V
1.4 to 2.0 V
10 A
PI3312-x0-LGIZ
2.5 V
2.0 to 3.1 V
10 A
■ VOUT margining
PI3301-x0-LGIZ
3.3 V
2.3 to 4.1 V
10 A
■ Fault reporting
PI3302-x0-LGIZ
5.0 V
3.3 to 6.5 V
10 A
■ Enable and SYNCI pin polarity
PI3303-x0-LGIZ
12 V
6.5 to 13.0 V
8A
■ Phase delay (interleaving multiple regulators)
PI3305-x0-LGIZ
15 V
10.0 to 16.0 V
8A
The ZVS architecture also enables high frequency operation
while minimizing switching losses and maximizing efficiency.
The high switching frequencyoperation reduces the size of the
external filtering components, improves power density, and
enables very fast dynamic response to line and load
transients. The PI33xx-x0 series sustains high switching
frequency all the way up to the rated input voltage without
sacrificing efficiency and, with its 20 ns minimum on-time,
supports large step down conversions up to 36 Vin.
*I2C is a trademark of NXP Semiconductors
• Fast and slow current limits
• -40°C to 125°C operating range (TJ)
• Optional I2C functionality & programmability:
Applications
• Rugged, defense applications
• High efficiency systems
• High voltage battery operation
Package Information
• 10 mm x 14 mm x 2.6 mm LGA SiP
Cool-Power®
Rev 1.8
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PI33xx-x0
Contents
Contents
Page
Contents
Application Description
Page
34
Order Information
3
Absolute Maximum Ratings
4
Output Voltage Trim
34
Block Diagram
4
Soft-Start Adjust and Tracking
35
Pin Description
5
Inductor Pairing
36
Package Pin-Out
5
Thermal Derating
36
PI3311-x0 (1.0 VOUT) Electrical Characteristics
6
Filter Considerations
36
PI3318-x0 (1.8 VOUT) Electrical Characteristics
9
Layout Guidelines
37
PI3312-x0 (2.5 VOUT) Electrical Characteristics
12
Recommended PCB Footprint and Stencil
38
PI3301-x0 (3.3 VOUT) Electrical Characteristics
16
Package Drawings
39
PI3302-x0 (5.0 VOUT) Electrical Characteristics
20
Revision History
40
PI3303-x0 (12.0 VOUT) Electrical Characteristics
24
Warranty
41
PI3305-x0 (15.0 VOUT) Electrical Characteristics
28
Functional Description
32
ENABLE (EN)
32
Remote Sensing
32
Switching Frequency Synchronization
32
Soft-Start
32
Output Voltage Trim
32
Output Current Limit Protection
33
Input Undervoltage Lockout
33
Input Overvoltage Lockout
33
Output Overvoltage Protection
33
Overtemperature Protection
33
Pulse Skip Mode (PSM)
33
Variable Frequency Operation
33
Parallel Operation
33
I2C Interface Operation
34
Cool-Power®
Rev 1.8
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PI33xx-x0
Order Information
Cool-Power
Output Range
IOUT Max
Package
Transport
Media
Set
Range
PI3311-00-LGIZ
1.0 V
1.0 to 1.4 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3318-00-LGIZ
1.8 V
1.4 to 2.0 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3312-00-LGIZ
2.5 V
2.0 to 3.1 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3301-00-LGIZ
3.3 V
2.3 to 4.1 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3302-00-LGIZ
5.0 V
3.3 to 6.5 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3303-00-LGIZ
12 V
6.5 to 13.0 V
8A
10 mm x 14 mm 123-pin LGA
TRAY
PI3305-00-LGIZ
15 V
10.0 to 16.0 V
8A
10 mm x 14 mm 123-pin LGA
TRAY
IOUT Max
Package
I2C Functionality & Programmability
Cool-Power
Output Range
Transport
Media
Set
Range
PI3311-20-LGIZ
1.0 V
1.0 to 1.4 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3318-20-LGIZ
1.8 V
1.4 to 2.0 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3312-20-LGIZ
2.5 V
2.0 to 3.1 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3301-20-LGIZ
3.3 V
2.3 to 4.1 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3302-20-LGIZ
5.0 V
3.3 to 6.5 V
10 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3303-20-LGIZ
12 V
6.5 to 13.0 V
8A
10 mm x 14 mm 123-pin LGA
TRAY
PI3305-20-LGIZ
15 V
10.0 to 16.0 V
8A
10 mm x 14 mm 123-pin LGA
TRAY
Cool-Power®
Rev 1.8
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800 927.9474
PI33xx-x0
Absolute Maximum Ratings
Name
Rating
VIN
-0.7 V to 36 V
VS1
-0.7 to 36 V, -4 V for 5 ns
SGND
100 mA
PGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM
-0.3 V to 5.5 V / 5 mA
VOUT
PI3311-x0-LGMZ
-0.3 V to 5.5 V
PI3318-x0-LGMZ
-0.5 V to 9 V
PI3312-x0-LGMZ
-0.8 V to 13 V
PI3301-x0-LGMZ
-1.0 V to 18 V
PI3302-x0-LGMZ
-1.5 V to 21 V
PI3303-x0-LGMZ
-3.6 V to 25 V
PI3305-x0-LGMZ
-4.5 V to 25 V
Storage Temperature
-65°C to 150°C
Operating Junction Temperature
-55°C to 125°C
Soldering Temperature for 20 seconds
245°C
ESD Rating
2 kV HBM
Notes: At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions
beyond those listed in the Electrical Specifications table is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted. Test conditions
are per the specifications within the individual product electrical characteristics..
Functional Block Diagram
Simplified Block Diagram (I2C pins SCL, SDA, ADR0, and ADR1 only active for PI33xx-20 device versions)
Cool-Power®
Rev 1.8
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800 927.9474
PI33xx-x0
Pin Description
Pin Name
Number
SGND
Block 1
Description
Signal Ground: Internal logic ground for EA, TRK, SYNCI, SYNCO, ADJ and I2C (options) communication returns.
SGND and PGND are star connected within the regulator package.
PGND
Block 2
Power Ground: VIN and VOUT power returns
VIN
Block 3
Input Voltage: and sense for UVLO, OVLO and feed forward ramp
VOUT
Block 5
Output Voltage: and sense for power switches and feed-forward ramp
VS1
Block 4
Switching Node: and ZVS sense for power switches
PGD
A1
Parallel Good: Used for parallel timing management intended for lead regulator.
EAO
A2
Error Amp Output: External connection for additional compensation and current sharing.
EN
A3
Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled;
Asserted low, regulator output disabled. Polarity is programmable via I2C interface.
REM
A5
ADJ
B1
Remote Sense: High side connection. Connect to output regulation point.
Adjust Input: An external resistor may be connected between ADJ pin and SGND or VOUT
to trim the output voltage up or down.
TRK
Soft-start and Track Input: An external capacitor may be connected between TRK pin
C1
and SGND to decrease the rate of rise during soft-start.
NC
K3, A4
SYNCO
K4
SYNCI
K5
No Connect: Leave pins floating.
Synchronization Output: Outputs a low signal for ½ of the minimum period for synchronization of other converters.
Synchronization Input: Synchronize to the falling edge of external clock frequency.
SYNCI is a high impedance digital input node and should always be connected to SGND when not in use.
SDA
D1
Data Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only.
SCL
E1
Clock Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only.
ADR1
H1
Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only.
ADR0
G1
Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only.
SYNCO
2
SYNCI
1
NC
Package Pin-Out
3
4
5
6
7
PGND
Block 2
8
9
10
11
12
SGND K
Block 1
J
13
14
VIN
Block 3
Block 1:
B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2
Block 2:
A8-10, B8-10, C8-10, D8-10, E4-10,
ADR1 H
F4-10, G4-10, H4-10, J4-10, K6-10
ADR0 G
SGND F
SCL E
Block 3:
G12-14, H12-14, J12-14, K12-14
Block 4:
A12-14, B12-14, C12-14, D12-14, E12-14
Block 5:
A6-7, B6-7, C6-7, D6-7
SDA D
TRK C
VS1
Block 4
ADJ B
PGD A
REM
NC
EN
EAO
VOUT
Block 5
Cool-Power®
Rev 1.8
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Page 5 of 41
09/2015
800 927.9474
PI33xx-x0
PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 125 nH [1]
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
VIN_DC
IIN_DC
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
Conditions
Input Specifications
Minimum 1 mA load required
VIN = 24 V, TC = 25°C, IOUT =10 A
Min
Typ
Max
Unit
8
24
476
36
V
mA
20
mA
1
mA
mA
V/µs
[2]
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A
VOUT_AC
IOUT = 5 A, COUT = 8 x 100 µF, 20 MHz BW [4]
[5]
IOUT_DC
Min 1 mA load required
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
0.987
1.0
1.0
1.013
1.4
0.10
0.10
20
10
12
7.10
6.80
37.0
36.1
130
7.60
7.25
0.33
38.4
0.77
128
500
20
135
30
8.00
7.60
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves
Cool-Power®
Rev 1.8
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Page 6 of 41
09/2015
800 927.9474
PI33xx-x0
PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 125 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
fS
Fault Restart Delay
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
Sync In (SYNCI)
Relative to set switching frequency [3]
500
kHz
30
ms
50
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves
Cool-Power®
Rev 1.8
vicorpower.com
Page 7 of 41
09/2015
800 927.9474
PI33xx-x0
PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
12 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 1 — Efficiency at 25°C
Figure 4 — Transient Response 2 A to 7 A, at 5 A/µs
Figure 2 — Short Circuit Test
Figure 5 — Output Ripple 24 VIN, 1.0 VOUT at 10 A
Switching Frequency vs. Load Current
600
Frequency (kHz)
500
400
12 Vin
24 Vin
36 Vin
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 3 — Switching Frequency vs. Load Current
Figure 6 — Output Ripple 24 VIN, 1.0 VOUT at 5 A
Cool-Power®
Rev 1.8
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Page 8 of 41
09/2015
800 927.9474
PI33xx-x0
PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 155 nH [1]
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
VIN_DC
IIN_DC
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Conditions
Input Specifications
Minimum 1 mA load required
VIN = 24 V, TC = 25°C, IOUT =10 A
Typ
Max
Unit
8
24
835
36
V
mA
20
mA
1
mA
mA
V/µs
[2]
Disabled
Enabled (no load)
2.0
2.5
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
Output Specifications
[2]
VOUT_DC
[3]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A
VOUT_AC
IOUT = 5 A, COUT = 6 x 100 µF, 20 MHz BW [4]
[5]
IOUT_DC
IOUT_CL
VIN UVLO Start Threshold
VIN UVLO Stop Threshold
VIN UVLO Hysteresis
VIN OVLO Start Threshold
VIN OVLO Stop Threshold
VIN OVLO Hysteresis
VIN UVLO/OVLO Fault Delay Time
VIN UVLO/OVLO Response Time
Output Overvoltage Protection
Protection
VUVLO_START
VUVLO_STOP
VUVLO_HYS
VOVLO_START
VOVLO_STOP
VOVLO_HYS
tf_DLY
Number of the switching freq cycles
tf
VOVP
Above VOUT
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Min
TOTP
TOTP_HYS
1.773
1.4
1.8
1.827
2.0
0.10
0.10
25
10
12
7.10
6.80
37.0
36.1
7.60
7.25
0.33
38.4
8.00
7.60
V
V
V
V
V
V
Cycles
ns
%
140
°C
°C
0.77
128
500
20
130
135
30
V
V
%
%
mVp-p
A
A
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.8
vicorpower.com
Page 9 of 41
09/2015
800 927.9474
PI33xx-x0
PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 155 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
600
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
V
V
ns
ns
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.8
vicorpower.com
Page 10 of 41
09/2015
800 927.9474
PI33xx-x0
PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
8 Vin
12 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 7 — Efficiency at 25°C
Figure 10 — Transient Response 2 A to 7 A, at 5 A/µs
Figure 8 — Short Circuit Test
Figure 11 — Output Ripple 24 VIN, 1.8 VOUT at 10 A
Switching Frequency vs. Load Current
700
Frequency (kHz)
600
500
8 Vin
12 Vin
24 Vin
36 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 9 — Switching Frequency vs. Load Current
Figure 12 — Output Ripple 24 VIN, 1.8 VOUT at 5 A
Cool-Power®
Rev 1.8
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Page 11 of 41
09/2015
800 927.9474
PI33xx-x0
PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
1.14
36
V
mA
20
mA
1
mA
mA
V/µs
Input Specifications
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
VIN_DC
IIN_DC
[7]
IIN_Short
[2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
VIN = 24 V, TC = 25°C, IOUT =10 A
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3] [7]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A
VOUT_AC
IOUT = 5 A, COUT = 4 x 100 µF, 20 MHz BW [4]
[5] [7]
IOUT_DC
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
1.773
2.0
1.8
2.5
0.10
0.10
28
1.827
3.1
10
12
7.10
6.80
37.0
36.1
130
7.60
7.25
0.33
38.4
0.77
128
500
20
135
30
8.00
7.60
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 12 of 41
09/2015
800 927.9474
PI33xx-x0
PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
500
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
V
V
ns
ns
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 13 of 41
09/2015
800 927.9474
PI33xx-x0
PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics
Efficiency at 25°C
95
90
Efficiency
85
80
12 Vin
24 Vin
36 Vin
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 13 — Efficiency at 25°C
Figure 16 — Transient Response 5 A to 10 A, at 5 A/µs
Figure 14 — Short Circuit Test
Figure 17 — Output Ripple 24 VIN, 2.5 VOUT at 10 A
Switching Frequency vs. Load Current
600
Frequency (kHz)
500
400
12 Vin
24 Vin
36 Vin
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 15 — Switching Frequency vs. Load Current
Figure 18 — Output Ripple 24 VIN, 2.5 VOUT at 5 A
Cool-Power®
Rev 1.8
vicorpower.com
Page 14 of 41
09/2015
800 927.9474
PI33xx-x0
PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics
Load Current vs. Ambient Temperature, 0 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 19 — Load Current vs. Ambient Temperature, 0 LFM
Load Current vs. Ambient Temperature, 200 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 20 — Load Current vs. Ambient Temperature, 400 LFM
Load Current vs. Ambient Temperature, 400 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 21 — Load Current vs. Ambient Temperature, 200 LFM
Cool-Power®
Rev 1.8
vicorpower.com
Page 15 of 41
09/2015
800 927.9474
PI33xx-x0
PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
1.49
36
V
mA
20
mA
1
mA
mA
V/µs
Input Specifications
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
VIN_DC
IIN_DC
[7]
IIN_Short
[2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
VIN = 24 V, TC = 25°C, IOUT =10 A
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3] [7]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A
VOUT_AC
IOUT = 5 A, COUT = 4 x 100 µF, 20 MHz BW [4]
IOUT_DC
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
3.25
2.3
3.30
3.3
0.10
0.10
37.5
3.36
4.1
10
12
7.10
6.80
37.0
36.1
130
7.60
7.25
0.33
38.4
0.77
128
500
20
135
30
8.00
7.60
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 16 of 41
09/2015
800 927.9474
PI33xx-x0
PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
650
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
V
V
ns
ns
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between Vin-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 17 of 41
09/2015
800 927.9474
PI33xx-x0
PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
12 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 22 — Efficiency at 25°C
Figure 25 — Transient Response 5 A to 10 A, at 5 A/µs
Figure 23 — Short Circuit Test
Figure 26 — Output Ripple 24 VIN, 2.5 VOUT at 10 A
Switching Frequency vs. Load Current
700
Frequency (kHz)
600
500
12 Vin
24 Vin
36 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 24 — Switching Frequency vs. Load Current
Figure 27 — Output Ripple 24 VIN, 2.5 VOUT at 5 A
Cool-Power®
Rev 1.8
vicorpower.com
Page 18 of 41
09/2015
800 927.9474
PI33xx-x0
PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics
Load Current vs. Ambient Temperature, 0 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 28 — Load Current vs. Ambient Temperature, 0 LFM
Load Current vs. Ambient Temperature, 200 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 29 — Load Current vs. Ambient Temperature, 400 LFM
Load Current vs. Ambient Temperature, 400 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 30 — Load Current vs. Ambient Temperature, 200 LFM
Cool-Power®
Rev 1.8
vicorpower.com
Page 19 of 41
09/2015
800 927.9474
PI33xx-x0
PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
2.23
36
V
mA
20
mA
1
mA
mA
V/µs
Input Specifications
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
VIN_DC
IIN_DC
[7]
IIN_Short
[2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
VIN = 24 V, TC = 25°C, IOUT =10 A
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3] [7]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A
VOUT_AC
IOUT = 5 A, COUT = 4 x 47 µF, 20 MHz BW [4]
[5] [7]
IOUT_DC
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
4.93
3.3
5.00
5.07
6.5
0.10
0.10
30
10
12
7.10
6.80
37.0
36.1
130
7.60
7.25
0.33
38.4
0.77
128
500
20
135
30
8.00
7.60
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 20 of 41
09/2015
800 927.9474
PI33xx-x0
PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
1.0
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
MHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
V
V
ns
ns
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
vicorpower.com
Page 21 of 41
09/2015
800 927.9474
PI33xx-x0
PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
12 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 31 — Efficiency at 25°C
Figure 34 — Transient Response 5 A to 10 A, at 5 A/µs
Figure 32 — Short Circuit Test
Figure 35 — Output Ripple 24 VIN, 2.5 VOUT at 10 A
Switching Frequency vs. Load Current
1.2
Frequency (MHz)
1.0
0.8
12 Vin
24 Vin
36 Vin
0.6
0.4
0.2
0.0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
Figure 33 — Switching Frequency vs. Load Current
Figure 36 — Output Ripple 24 VIN, 2.5 VOUT at 5 A
Cool-Power®
Rev 1.8
vicorpower.com
Page 22 of 41
09/2015
800 927.9474
PI33xx-x0
PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics
Load Current vs. Ambient Temperature, 0 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 37 — Load Current vs. Ambient Temperature, 0 LFM
Load Current vs. Ambient Temperature, 200 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 38 — Load Current vs. Ambient Temperature, 400 LFM
Load Current vs. Ambient Temperature, 400 LFM
12
Load Current (A)
10
8
36 Vin
24 Vin
8 Vin
6
4
2
0
50
75
100
125
Ambient Temperature (°C)
Figure 39 — Load Current vs. Ambient Temperature, 200 LFM
Cool-Power®
Rev 1.8
vicorpower.com
Page 23 of 41
09/2015
800 927.9474
PI33xx-x0
PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
17.4
24
4.15
36
V
mA
20
mA
1
mA
mA
V/µs
Input Specifications
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
VIN_DC
IIN_DC
[7]
IIN_Short
[2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
VIN = 24 V, TC = 25°C, IOUT = 8 A
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3][7]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <8 A
VOUT_AC
IOUT = 4 A, COUT = 4 x 22 µF, 20 MHz BW [4]
[5]
IOUT_DC
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
11.82
6.5
12.0
12
0.10
0.10
60
12.18
13.0
8
9
15.80
15.00
37.0
36.1
130
16.60
15.80
0.77
38.4
0.77
128
500
20
135
30
17.40
16.60
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
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Page 24 of 41
09/2015
800 927.9474
PI33xx-x0
PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
1.4
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
MHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
Source 1 mA
Sink 1 mA
20 pF load
SYNCO Fall Time
tSYNCO_FT
20 pF load
4.5
10
V
V
ns
10
ns
0.5
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
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Page 25 of 41
09/2015
800 927.9474
PI33xx-x0
PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
17.4 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
Load Curent (A)
Figure 40 — Efficiency at 25°C
Figure 43 — Transient Response 5 A to 10 A, at 5 A/µs
Figure 41 — Short Circuit Test
Figure 44 — Output Ripple 24 VIN, 2.5 VOUT at 10 A
Switching Frequency vs. Load Current
1.6
Frequency (MHz)
1.4
1.2
1.0
17.4 Vin
24 Vin
36 Vin
0.8
0.6
0.4
0.2
0.0
1
2
3
4
5
6
7
8
Load Curent (A)
Figure 42 — Switching Frequency vs. Load Current
Figure 45 — Output Ripple 24 VIN, 2.5 VOUT at 5 A
Cool-Power®
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PI33xx-x0
PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics
Load Current vs. Ambient Temperature, 0 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
18 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 46 — Load Current vs. Ambient Temperature, 0 LFM
Load Current vs. Ambient Temperature, 200 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
18 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 47 — Load Current vs. Ambient Temperature, 400 LFM
Load Current vs. Ambient Temperature, 400 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
18 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 48 — Load Current vs. Ambient Temperature, 200 LFM
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PI33xx-x0
PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
20.4
24
5.15
36
V
mA
20
mA
1
mA
mA
V/µs
Input Specifications
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
VIN_DC
IIN_DC
[7]
IIN_Short
[2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
VIN = 24 V, TC = 25°C, IOUT = 8 A
Disabled
Enabled (no load)
2.0
2.5
Output Specifications
[2]
VOUT_DC
[3] [7]
VOUT_DC
VOUT (VIN) @25°C, 8 V <VIN <36 V
VOUT (IOUT) @25°C, 0.5 A <IOUT <8 A
VOUT_AC
IOUT = 4 A, COUT = 4 x 22 µF, 20 MHz BW [4]
[5] [7]
IOUT_DC
IOUT_CL
Protection
VIN UVLO Start Threshold
VUVLO_START
VIN UVLO Stop Threshold
VUVLO_STOP
VIN UVLO Hysteresis
VUVLO_HYS
VIN OVLO Start Threshold
VOVLO_START
VIN OVLO Stop Threshold
VOVLO_STOP
VIN OVLO Hysteresis
VOVLO_HYS
VIN UVLO/OVLO Fault Delay Time
tf_DLY
Number of the switching freq cycles
VIN UVLO/OVLO Response Time
tf
Output Overvoltage Protection
VOVP
Above VOUT
Over-Temperature Fault Threshold
TOTP
Over-Temperature Restart Hysteresis
TOTP_HYS
14.78
10.0
15.0
15
0.1
0.1
60
15.23
16
8
9
18.4
17.4
37.0
36.1
130
19.4
18.4
0.90
38.4
0.77
128
500
20
135
30
20.4
19.4
140
V
V
%
%
mVp-p
A
A
V
V
V
V
V
V
Cycles
ns
%
°C
°C
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-Vout must be maintained or a minimum load of 1mA required.
Cool-Power®
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Page 28 of 41
09/2015
800 927.9474
PI33xx-x0
PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics
Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
fSYNCI
VSYNCI
[6]
1.5
30
Sync In (SYNCI)
Relative to set switching frequency [3]
50
MHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
Source 1 mA
Sink 1 mA
20 pF load
20 pF load
4.5
0.5
10
10
V
V
ns
ns
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
VTRK_OV
ITRK
ITRK_DIS
tSS
0
20
-70
CTRK = 0 uF
1.04
1.2
40
-50
6.8
2.2
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2]
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3]
Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[4]
Refer to Output Ripple plots.
[5]
Refer to Load Current vs. Ambient Temperature curves.
[6]
Refer to Switching Frequency vs. Load current curves.
[7]
Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power®
Rev 1.8
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Page 29 of 41
09/2015
800 927.9474
PI33xx-x0
PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency
90
85
12 Vin
24 Vin
36 Vin
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
Load Curent (A)
Figure 49 — Efficiency at 25°C
Figure 52 — Transient Response 5 A to 10 A, at 5 A/µs
Figure 50 — Short Circuit Test
Figure 53 — Output Ripple 24 VIN, 2.5 VOUT at 10 A
Switching Frequency vs. Load Current
1.6
Frequency (MHz)
1.4
1.2
1.0
20.4 Vin
24 Vin
36 Vin
0.8
0.6
0.4
0.2
0.0
1
2
3
4
5
6
7
8
Load Curent (A)
Figure 51 — Switching Frequency vs. Load Current
Figure 54 — Output Ripple 24 VIN, 2.5 VOUT at 5 A
Cool-Power®
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PI33xx-x0
PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics
Load Current vs. Ambient Temperature, 0 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
21 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 55 — Load Current vs. Ambient Temperature, 0 LFM
Load Current vs. Ambient Temperature, 200 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
21 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 56 — Load Current vs. Ambient Temperature, 400 LFM
Load Current vs. Ambient Temperature, 400 LFM
9.0
Load Current (A)
8.0
7.0
6.0
36 Vin
24 Vin
21 Vin
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
Figure 57 — Load Current vs. Ambient Temperature, 200 LFM
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PI33xx-x0
Functional Description
The PI33xx-x0 is a family of highly integrated ZVS-Buck
regulators. The PI33xx-x0 has a set output voltage that is
trimmable within a prescribed range shown in Table 1.
Performance and maximum output current are characterized
with a specific external power inductor (see Table 4).
L1
VIN
VIN
CIN
PGND
VOUT
VS1
PI33xx
VOUT
COUT
REM
TRK
SYNCO
ADJ
EN
EAO
SGND
SYNCI
Switching Frequency Synchronization
The SYNCI input allows the user to synchronize the controller
switching frequency by an external clock referenced to SGND.
The external clock can synchronize the unit between 50% and
110% of the preset switching frequency (fS). For PI33xx-20
device versions only, the phase delay can be programmed via
I2C bus with respect to the clock applied at SYNCI pin. Phase
delay allows PI33xx-20 regulators to be paralleled and operate
in an interleaving mode.
The PI33xx-x0 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift
from SYNCO. This allows for the paralleling of two PI33xx-x0
devices without the need for further user programming or
external sync clock circuitry. The user can change the SYNCI
polarity to sync with the external clock rising edge via the I2C
data bus (PI33xx-20 device versions only).
When using the internal oscillator, the SYNCO pin provides a
5 V clock that can be used to sync other regulators. Therefore,
one PI33xx-x0 can act as the lead regulator and have
additional PI33xx-x0s running in parallel and interleaved.
Figure 58 — ZVS-Buck with required components
For basic operation, Figure 58 shows the connections and
components required. No additional design or settings
are required.
ENABLE (EN)
EN is the enable pin of the converter. The EN Pin is referenced
to SGND and permits the user to turn the regulator on or off.
The EN default polarity is a positive logic assertion. If the EN
pin is left floating or asserted high, the converter output is
enabled. Pulling EN pin below 0.8 Vdc with respect to SGND
will disable the regulator output.
The EN input polarity can be programmed (PI33xx-20 device
versions only) via the I2C data bus. When the EN pin polarity
is programmed for negative logic assertion; and if the EN pin
is left floating, the regulator output is enabled. Pulling the EN
pin above 1.0 Vdc with respect to SGND, will disable the
regulator output.
Remote Sensing
An internal 100 Ω resistor is connected between REM pin and
VOUT pin to provide regulation when the REM connection is
broken. Referring to Figure 58, it is important to note that L1
and COUT are the output filter and the local sense point for the
power supply output. As such, the REM pin should be
connected at COUT as the default local sense connection unless
remote sensing to compensate additional distribution losses
in the system. The REM pin should not be left floating.
Soft-Start
The PI33xx-x0 includes an internal soft-start capacitor to
ramp the output voltage in 2 ms from 0 V to full output
voltage. Connecting an external capacitor from the TRK pin to
SGND will increase the start-up ramp period. See, “Soft Start
Adjustment and Track,” in the Applications Description
section for more details.
Output Voltage Trim
The PI33xx-x0 output voltage can be trimmed up from the
preset output by connecting a resistor from ADJ pin to SGND
and can be trimmed down by connecting a resistor from ADJ
pin to VOUT. The Table 1 defines the voltage ranges for the
PI33xx-x0 family.
Device
Output Voltage
Set
Range
PI3311-x0-LGIZ
1.0 V
1.0 to 1.4 V
PI3318-x0-LGIZ
1.8 V
1.4 to 2.0 V
PI3312-x0-LGIZ
2.5 V
2.0 to 3.1 V
PI3301-x0-LGIZ
3.3 V
2.3 to 4.1 V
PI3302-x0-LGIZ
5.0 V
3.3 to 6.5 V
PI3303-x0-LGIZ
12 V
6.5 to 13.0 V
PI3305-x0-LGIZ
15 V
10.0 to 16.0 V
Table 1 — PI33xx-x0 family output voltage range
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PI33xx-x0
Output Current Limit Protection
PI33xx-x0 has two methods implemented to protect from
output short or over current condition.
Slow Current Limit protection: prevents the output load from
sourcing current higher than the regulator’s maximum rated
current. If the output current exceeds the Current Limit
(IOUT_CL) for 1024 us, a slow current limit fault is initiated and
the regulator is shutdown which eliminates output current
flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle is
initiated. This restart cycle will be repeated indefinitely until
the excessive load is removed.
Fast Current Limit protection: PI33xx-x0 monitors the
regulator inductor current pulse-by-pulse to prevent the
output from supplying very high current due to sudden low
impedance short (50 A Typical). If the regulator senses a high
inductor current pulse, it will initiate a fault and stop
switching until Fault Restart Delay ends and then initiate a
soft-start cycle.
Both the Fast and Slow current limit faults are stored in a
Fault Register and can be read and cleared (PI33xx-20 device
versions only) via I2C data bus.
Input Undervoltage Lockout
If VIN falls below the input Undervoltage Lockout (UVLO)
threshold, but remains high enough to power the internal
bias supply, the PI33xx-x0 will complete the current cycle and
stop switching. If VIN recovers within 128 switching cycles,
the PI33xx-x0 will resume normal operation. If this time
limit is exceeded, the system will enter a low power state and
initiate a fault. The system will restart once the input voltage
is reestablished and after the Fault Restart Delay. A UVLO
fault is stored in a Fault Register and can be read and cleared
(PI33xx-20 device versions only) via I2C data bus.
Input Overvoltage Lockout
If VIN exceeds the input Overvoltage Lockout (OVLO)
threshold (VOVLO), while the controller is running, the
PI33xx-x0 will complete the current cycle and stop switching.
If VIN recovers within 128 switching cycles, the PI33xx-x0 will
resume normal operation. Otherwise, the system will enter a
low power state and sets an OVLO fault. The system will
resume operation when the input voltage falls below 98% of
the OVLO threshold and after the Fault Restart Delay. The
OVLO fault is stored in a Fault Register and can be read and
cleared (PI33xx-20 device versions only) via I2C data bus.
Output Overvoltage Protection
The PI33xx-x0 family is equipped with output Overvoltage
Protection (OVP) to prevent damage to input voltage sensitive
devices. If the output voltage exceeds 20% of its set regulated
value, the regulator will complete the current cycle, stop
switching and issue an OVP fault. The system will resume
operation once the output voltage falls below the OVP
threshold and after Fault Restart Delay. The OVP fault is
stored in a Fault Register and can be read and cleared
(PI33xx-20 device versions only) via I2C data bus.
Overtemperature Protection
The internal package temperature is monitored to prevent
internal components from reaching their thermal maximum.
If the Over Temperature Protection Threshold (OTP) is
exceeded (TOTP), the regulator will complete the current
switching cycle, enter a low power mode, set a fault flag, and
will soft-start when the internal temperature falls below OverTemperature Restart Hysteresis (TOTP_HYS). The OTP fault is
stored in a Fault Register and can be read and cleared
(PI33xx-20 device versions only) via I2C data bus.
Pulse Skip Mode (PSM)
PI33xx-x0 features a PSM to achieve high efficiency at light
loads. The regulators are setup to skip pulses if EAO falls
below a PSM threshold. Depending on conditions and
component values, this may result in single pulses or several
consecutive pulses followed by skipped pulses. Skipping
cycles significantly reduces gate drive power and improves
light load efficiency. The regulator will leave PSM once the
EAO rises above the Skip Mode threshold.
Variable Frequency Operation
Each PI33xx-x0 is preprogrammed to a base operating
frequency, with respect to the power stage inductor
(see Table 4), to operate at peak efficiency across line and load
variations. At low line and high load applications, the base
frequency will decrease to accommodate these extreme
operating ranges. By stretching the frequency, the ZVS
operation is preserved throughout the total input line voltage
range therefore maintaining optimum efficiency.
Parallel Operation
Paralleling modules can be used to increase the output
current capability of a single power rail and reduce output
voltage ripple.
L1
VIN
VIN
CIN
R1
VS1
VOUT
VOUT
COUT
PGND
PGD
PI33xx
(#1)
REM
SYNCI
SYNCO(#2)
SYNCI(#2)
EN(#2)
SYNCO
EN
EAO(#2)
EAO
TRK(#2)
TRK
SGND
L1
VIN
VIN
CIN
VOUT
PGND
PGD
SYNCO(#1)
SYNCI(#1)
EN(#1)
VS1
SYNCI
PI33xx
(#2)
REM
SYNCO
EN
EAO(#1)
EAO
TRK(#1)
TRK
SGND
Figure 59 — PI33xx-x0 parallel operation
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COUT
PI33xx-x0
The PI33xx-x0 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift
from SYNCO. This allows for the paralleling of two PI33xx-x0
devices without the need for further user programming or
external sync clock circuitry. The user can change the SYNCI
polarity to sync with the external clock rising edge via the I2C
data bus (PI33xx-20 device versions only).
By connecting the EAO pins and SGND pins of each module
together the units will share the current equally. When the
TRK pins of each unit are connected together, the units will
track each other during soft-start and all unit EN pins have to
be released to allow the units to start (See Figure 59). Also,
any fault event in any regulator will disable the other
regulators. The two regulators will be out of phase with each
other reducing output ripple (refer to Switching Frequency
Synchronization).
To provide synchronization between regulators over the
entire operational frequency range, the Parallel Good (PGD)
pin must be connected to the lead regulator’s (#1) SYNCI pin
and a 2.5 kΩ Resistor, R1, must be placed between SYNCO (#2)
return and the lead regulator’s SYNCI (#1) pin, as shown in
Figure 59. In this configuration, at system soft-start, the PGD
pin pulls SYNCI low forcing the lead regulator to initialize the
open-loop startup synchronization. Once the regulators reach
regulation, SYNCI is released and the system is now
synchronized in a closed-loop configuration which allows the
system to adjust, on the fly, when any of the individual
regulators begin to enter variable frequency mode in the loop.
Multi-phasing three regulators is possible (PI33xx-20 only)
with no change to the basic single-phase design. For more
information about how to program phase delays within the
regulator, please refer to Picor application note PI33xx-2x
Multi-Phase Design Guide.
Application Description
Output Voltage Trim
The PI33xx-x0 family of Buck Regulators provides seven
common output voltages: 1.0 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V, 12 V
and 15 V. A post-package trim step is implemented to offset
any resistor divider network errors ensuring maximum
output accuracy. With a single resistor connected from the
ADJ pin to SGND or REM, each device’s output can be varied
above or below the nominal set voltage (with the exception of
the PI3311-X0 which can only be above the set voltage of 1 V).
Output Voltage
Device
Set
Range
PI3311-x0-LGIZ
1.0 V
1.0 to 1.4 V
PI3318-x0-LGIZ
1.8 V
1.4 to 2.0 V
PI3312-x0-LGIZ
2.5 V
2.0 to 3.1 V
PI3301-x0-LGIZ
3.3 V
2.3 to 4.1 V
PI3302-x0-LGIZ
5.0 V
3.3 to 6.5 V
PI3303-x0-LGIZ
12 V
6.5 to 13.0 V
PI3305-x0-LGIZ
15 V
10.0 to 16.0 V
Table 2 — PI33xx-x0 family output voltage range
The remote pin (REM) should always be connected to the
VOUT pin, if not used, to prevent an output voltage offset.
Figure 60 shows the internal feedback voltage divider
network.
I2C Interface Operation
PI33xx-20 devices provide an I2C digital interface that enables
the user to program the EN pin polarity (from high to low
assertion) and switching frequency synchronization
phase/delay. These are one time programmable options
to the device.
VOUT
R4
REM
Also, the PI33xx-20 devices allow for dynamic VOUT margining
via I2C that is useful during development (settings stored in
volatile memory only and not retained by the device). The
PI33xx-20 also have the option for fault telemetry including:
Rlow
R1
ADJ
+
Rhigh
R2
•
•
•
•
•
1.0 Vdc
Fast/Slow current limit
Output voltage high
Input overvoltage
Input undervoltage
Over temperature protection
SGND
Figure 60 — Internal resistor divider network
For more information about how to utilize the I2C interface
please refer to Picor application note PI33xx-2x I2C Digital
Interface Guide.
R1, R2, and R4 are all internal 1.0 % resistors and Rlow and
Rhigh are external resistors for which the designer can add to
modify VOUT to a desired output. The internal resistor value
for each regulator is listed below in Table 3.
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PI33xx-x0
Device
R1
R2
R4
PI3311-x0-LGIZ
1k
Open
100
PI3318-x0-LGIZ
0.806 k
1.0 k
100
PI3312-x0-LGIZ
1.5 k
1.0 k
100
PI3301-x0-LGIZ
2.61 k
1.13 k
100
PI3302-x0-LGIZ
4.53 k
1.13 k
100
PI3303-x0-LGIZ
11.0 k
1.0 k
100
PI3305-x0-LGIZ
14.0 k
1.0 k
100
Table 3 — PI33xx-x0 Internal divider values
By choosing an output voltage value within the ranges stated
in Table 2, VOUT can simply be adjusted up or down by
selecting the proper Rhigh or Rlow value, respectively. The
following equations can be used to calculate Rhigh and
Rlow values:
slope is controlled by an internal 100 nF and a fixed charge
current to provide a minimum startup time of 2 ms (typical)
for all PI33xx-x0 regulators. By adding an additional external
capacitor to the TRK pin, the soft-start time can be increased
further. The following equation can be used to calculate the
proper capacitor for a desired soft-start times:
CTRK = (tTRK x ITRK) – 100 x 10 -9,
Where, tTRK is the soft-start time and ITRK is a 50 uA internal
charge current (see Electrical Characteristics for limits).
There is typically either proportional or direct tracking
implemented within a design. For proportional tracking
between several regulators at startup, simply connect all
devices TRK pins together. This type of tracking will force all
connected regulators to startup and reach regulation at the
same time (see Figure 61(a).
VOUT 1
VOUT 2
(a)
Master VOUT
VOUT 2
If, for example, a 4.0 V output is needed, the user should
choose the regulator with a trim range covering 4.0 V from
Table 2. For this example, the PI3301 is selected (3.3 V set
voltage). First step would be to use Equation (1) to calculate
Rhigh since the required output voltage is higher than the
regulator set voltage. The resistor-divider network values for
the PI3301 are can be found in Table 3 and are R1 = 2.61 kΩ
and R2 = 1.13 kΩ. Inserting these values in to Equation (1),
Rhigh is calculated as follows:
(b)
+
Figure 61 — PI33xx-x0 tracking methods
For Direct Tracking, choose the regulator with the highest
output voltage as the master and connect the master to the
TRK pin of the other regulators through a divider (Figure 62)
with the same ratio as the slave’s feedback divider (see Table 3
for values).
Master VOUT
Resistor R_high should be connected as shown in Figure 60 to
achieve the desired 4.0 V regulator output. No external R_low
resistor is need in this design example since the trim is above
the regulator set voltage.
PI33xx
TRK
Slave
The PI3420 output voltage can only be trimmed higher than
the factory 1 V setting. The following Equation (3) can be
used calculate Rhigh values for the PI3420 regulators.
R1
R2
SGND
Figure 62 — Voltage divider connections for direct tracking
Soft-Start Adjust and Tracking
The TRK pin offers a means to increase the regulator’s softstart time or to track with additional regulators. The soft-start
All connected regulators’ soft-start slopes will track with this
method. Direct tracking timing is demonstrated in Figure
61(b). All tracking regulators should have their Enable (EN)
pins connected together to work properly.
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PI33xx-x0
depending upon line and load conditions.
Inductor Pairing
The PI33xx-x0 utilizes an external inductor. This inductor has
been optimized for maximum efficiency performance. Table 4
details the specific inductor value and part number utilized
for each PI33xx-x0 device which are available from
Coiltronics and Eaton. Data sheets are available at:
http://www.cooperindustries.com
Device
Inductor
[nH]
Inductor
Part Number
Manufacturer
PI3311-x0
125
FPV1006-125-R
Eaton
PI3318-x0
150
FPV1006-150-R
Eaton
PI3312-x0
200
FPT705-200-R
Coiltronics
PI3301-x0
200
FPT705-200-R
Coiltronics
PI3302-x0
200
FPT705-200-R
Coiltronics
PI3303-x0
230
FPT705-230-R
Coiltronics
PI3305-x0
230
FPT705-230-R
Coiltronics
Thermal measurements were made using a standard
PI33xx-x0 Evaluation board which is 3 x 4 inches in area and
uses 4-layer, 2 oz copper. Thermal measurements were made
on the three main power devices, the two internal MOSFETs
and the external inductor, with air flows of 0, 200,
and 400 LFM.
Filter Considerations
The PI33xx-x0 requires input bulk storage capacitance as well
as low impedance ceramic X5R input capacitors to ensure
proper start up and high frequency decoupling for the power
stage. The PI33xx-x0 will draw nearly all of the high
frequency current from the low impedance ceramic
capacitors when the main high side MOSFET is conducting.
During the time the high side MOSFET is off, they are
replenished from the bulk capacitor. If the input impedance is
high at the switching frequency of the converter, the bulk
capacitor must supply all of the average current into the
converter, including replenishing the ceramic capacitors. This
value has been chosen to be 100 μF so that the PI33xx-x0 can
start up into a full resistive load and supply the output
capacitive load with the default minimum soft start capacitor
when the input source impedance is 50 Ohms at 1 MHz. The
ESR for this capacitor should be approximately 20 mΩ. The
RMS ripple current in this capacitor is small, so it should not
be a concern if the input recommended ceramic capacitors
are used. Table 5 shows the recommended input and output
capacitors to be used for the various models as well as
expected transient response, RMS ripple currents per
capacitor, and input and output ripple voltages. Table 6
includes the recommended input and output
ceramic capacitors.
Table 4 — PI33xx-x0 Inductor pairing
Thermal Derating
Thermal de-rating curves are provided that are based on
component temperature changes versus load current, input
voltage and air flow. It is recommended to use these curves as
a guideline for proper thermal de-rating. These curves
represent the entire system and are inclusive to both the Picor
regulator and the external inductor. Maximum thermal
operation is limited by either the MOSFETs or inductor
Device
VIN
(V)
PI3311
24
PI3318
24
PI3312
24
PI3301
24
PI3302
24
PI3303
24
PI3305
24
ILOAD
(A)
10
5
10
5
CINPUT
Ceramic
X5R
CINPUT
Bulk
Elec.
COUTPUT
Ceramic
X5R
CINPUT
Ripple
Current
(IRMS)
COUTPUT
Ripple
Current
(IRMS)
4 x 4.7 µF
50 V
100 µF
50 V
8 X 100 µF
2 X 1 µF
1 X 0.1 µF
0.5
0.8
4 x 4.7 µF
50 V
100 µF
50 V
6 X 100 µF
2 X 1 µF
1 X 0.1 µF
0.5
0.8
4 x 4.7 µF
100 µF
50 V
4 X 100 µF
2 X 1 µF
1 X 0.1 µF
1
1.75
4 x 4.7 µF
100 µF
50 V
4 X 100 µF
2 X 1 µF
1 X 0.1 µF
1.05
1.625
4 x 4.7 µF
100 µF
50 V
4 X 47 µF
2 X 1 µF
1 X 0.1 µF
1.2
1.5
4 x 4.7 µF
100 µF
50 V
4 X 22 µF
2 X 1 µF
1 X 0.1 µF
1.3
1.36
4 x 4.7 µF
100 µF
50 V
4 X 22 µF
2 X 1 µF
1 X 0.1 µF
1.38
1.2
10
5
10
5
10
5
8
4
8
4
Input
Ripple
(mVpp)
Output
Ripple
(mVpp)
120
20
100
15
120
20
100
15
150
50
100
24
200
40
125
33
220
50
140
30
275
100
150
60
280
150
160
75
Table 5 — Recommended input and output capacitance
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Output
Ripple
(mVpp)
Recovery
Time
(µs)
Load
Step
(A)
(Slew/µs)
-/+40
40
5
(5 A/µs)
-/+40
40
5
(5 A/µs)
-/+80
25
5
(10 A/µs)
-/+100
20
5
(1 0A/µs)
-/+170
30
5
(5 A/µs)
-/+300
30
4
(10 A/µs)
-/+400
30
4
(10 A/µs)
PI33xx-x0
MURATA PART NUMBER
DESCRIPTION
GRM188R71C105KA12D
1uF 16V 0603 X7R
GRM319R71H104KA01D
0.1uF 50V 1206 X7R
GRM31CR60J107ME39L
100uF 6.3V 1206 X5R
GRM31CR71H475KA12K
4.7uF 50V 1206 X7R
GRM31CR61A476ME15L
47uF 10V 1206 X5R
GRM31CR61E226KE15L
22uF 25V 1206 X5R
When Q1 is on and Q2 is off, the majority of CIN’s current is
used to satisfy the output load and to recharge the COUT
capacitors. When Q1 is off and Q2 is on, the load current is
supplied by the inductor and the COUT capacitor as shown in
Figure 65. During this period CIN is also being recharged by
the VIN. Minimizing CIN loop inductance is important to
reduce peak voltage excursions when Q1 turns off. Also, the
difference in area between the CIN loop and COUT loop is vital
to minimize switching and GND noise.
Table 6 — Capacitor manufacturer part numbers
Layout Guidelines
I
CNV
NV
To optimize maximum efficiency and low noise performance
from a PI33xx-x0 design, layout considerations are necessary.
Reducing trace resistance and minimizing high current loop
returns along with proper component placement will
contribute to optimized performance.
A typical buck converter circuit is shown in Figure 63. The
potential areas of high parasitic inductance and resistance are
the circuit return paths, shown as LR below.
COUT
Figure 65 — Current flow: Q2 closed
The recommended component placement, shown in Figure
66, illustrates the tight path between CIN and COUT
(and VIN and VOUT) for the high AC return current. This
optimized layout is used on the PI33xx-x0 evaluation board.
VIN
VOUT
Figure 63 — Typical Buck Converter
COUT
GND
The path between the COUT and CIN capacitors is of particular
importance since the AC currents are flowing through both of
them when Q1 is turned on.
CIN
VSW
VIN
Figure 64, schematically, shows the reduced trace length
between input and output capacitors. The shorter path lessens
the effects that copper trace parasitics can have on the
PI33xx-x0 performance.
I
NV
GND
Figure 66 — Recommended component placement and metal routing
CNV
Figure 67 details the recommended receiving footprint for
PI33xx-x0 10 mm x 14 mm package. All pads should have a
final copper size of 0.55 mm x 0.55 mm, whether they are
solder-mask defined or copper defined, on a 1 mm x 1 mm
grid. All stencil openings are 0.45mm when using either a
COUT
Figure 64 — Current flow: Q1 closed
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PI33xx-x0
Recommended PCB Footprint and Stencil
Figure 67 — Recommended Receiving PCB footprint
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PI33xx-x0
Package Drawings
DIMESIONAL REFERENCES
REF.
MIN
NOM
2.50
2.56
A
A1
A2
0.50
0.55
b
L
0.50
0.55
14.00 BSC
D
10.00 BSC
E
13.00 BSC
D1
E1
9.00 BSC
e
1.00 BSC
0.10
0.15
L1
aaa
bbb
ccc
ddd
eee
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MAX
2.62
0.05
2.57
0.60
0.60
0.20
0.10
0.10
0.08
0.10
0.08
PI33xx-x0
Revision History
Revision
Date
1.5
06/13
1.6
Description
Page Number(s)
Last release in old format
n/a
08/03/15
Reformatted in new template
n/a
1.7
08/21/15
Formatting edits
6, 21, 22, 25, 26, 29, 30, 36
1.8
09/??/15
Formatting edits
6, 21, 22, 25, 26, 29, 30, 36
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PI33xx-x0
Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor makes no
representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves the right to make
changes to any products, specifications, and product descriptions at any time without notice. Information published by Vicor has been checked and
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Specifications are subject to change without notice.
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The products described on this data sheet are protected by the following U.S. Patents Numbers:
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